Roller skate

ABSTRACT

The present utility model discloses a roller skate. The rollers are divided into the front roller group and the rear roller group, and the rear roller group is rotatably disposed at the bottom of the skate body through the reversing mechanism, so that switching of the rear roller group between line arrangement and row arrangement is realized, the scope of application of the roller skate is effectively extended, and the roller skate has higher practicability.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit and priority of Chinese patent application No. 202120518329.2, filed on Mar. 11, 2021, disclosure of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present utility model relates to the technical field of roller skating devices, in particular to a roller skate.

BACKGROUND

Roller skates are a kind of popular roller skating device. An existing roller skate is generally provided with three to four rollers which are disposed at the bottom of a skate body in a single line. Such a traditional inline skate has higher requirements for users. For beginners, it is difficult to control and stabilize, and the beginners are prone to falling, which makes people feel intimidated or even fearful, and in turn leads to discouragement of roller skating.

SUMMARY

The present utility model aims to solve one of the above technical problems at least to a certain extent.

The present utility model provides a roller skate, including a skate body and rollers disposed below the skate body. The rollers are divided into a front roller group and a rear roller group. The rear roller group is disposed at a bottom of the skate body through a reversing mechanism. The rear roller group includes a plurality of rear rollers. The reversing mechanism controls the plurality of rear rollers to be arranged in a line or in a row, and a traveling direction of the plurality of rear rollers always faces a front and rear direction of the skate body.

Further, the reversing mechanism includes:

a reversing base, including a rotating bracket, wherein the rotating bracket is rotatably disposed at the bottom of the skate body, and the plurality of rear rollers are rotatably disposed on the rotating bracket;

a reversing transmission mechanism, in transmission connection with each rear roller and the rotating bracket, and configured to drive each rear roller and the rotating bracket to rotate so that the plurality of rear rollers can be arranged in a line or in a row; and

a reversing adjustment switch, detachably abutting against the rotating bracket, wherein the reversing adjustment switch can release locking of the rotating bracket when reversing is needed, and lock the rotating bracket when the plurality of rear rollers are arranged in a line or in a row.

Further, the rear roller group is provided with two rear rollers, the rotating bracket is provided with two transmission holes located on the same diameter line and radially symmetrical, and the two rear rollers are respectively rotatably installed at the transmission holes through corresponding rear roller brackets; and the two rear rollers can be driven by the rotating bracket to rotate together around an axis of the rotating bracket, and the two rear rollers can respectively rotate around axes of the transmission holes in the transmission holes.

Further, the reversing transmission mechanism includes:

an inner tooth groove disposed in the bottom of the skate body; and

guide gears meshing with the inner tooth groove, wherein there are two guide gears, and the two guide gears are fixedly connected with the two rear rollers one by one.

Further, the rear roller brackets abut against a first side of the rotating bracket, the guide gears abut against a second side of the rotating bracket, and the guide gears are fixedly installed on the rear roller brackets; and upper top surfaces of the rear roller brackets are provided with positioning lugs, positioning grooves are disposed in positions, corresponding to the positioning lugs, of lower bottom surfaces of the guide gears, and the positioning lugs are inserted in the positioning grooves.

Further, the inner tooth groove and the guide gears are provided with a rotating limiting structure in a matched mode, and the rotating limiting structure is configured to limit a rotatable angle of the rotating bracket to be plus or minus 90 degrees; and the rotating limiting structure includes second rotating limiting bosses disposed on the guide gears, and rotating limiting grooves disposed in the inner tooth groove.

Further, the reversing base further includes a rotating cover plate, and the rotating bracket is rotatably disposed at the bottom of the skate body through the rotating cover plate; and a middle of the rotating cover plate is provided with a rotating avoiding hole, and a first rotating limiting boss abutting against an inner side wall of the rotating avoiding hole is disposed at a position, corresponding to the rotating avoiding hole, of the rotating cover plate.

Further, the reversing adjustment switch includes:

a reversing switch main body; and

a reversing elastic member configured to elastically dispose the reversing switch main body on one side of the rotating bracket;

an outer side of the rotating bracket is provided with a concave locking notch; the reversing switch main body includes a locking part matched with the locking notch to cooperatively lock the rotating bracket, and a control part configured to control the locking part to be inserted into or removed from the locking notch; and a reset direction of the reversing elastic member faces the locking notch.

Further, the reversing switch main body further includes a fixing part, the fixing part is fixed to the skate body through a fixing member, and the skate body is provided with a fixing member moving groove for the fixing member to move accordingly when the locking part is inserted into or removed from the locking notch.

Further, the skate body includes a heel and a toe cap, the heel and the toe cap are provided with a size adjusting mechanism in a matched manner, and the size adjusting mechanism includes:

a size adjusting switch elastically disposed at a bottom of the heel;

a plurality of size adjusting clamping openings disposed in a bottom of the toe cap and arranged in a front and rear direction to limit different skate lengths, wherein the size adjusting switch can be inserted into or removed from the size adjusting clamping openings; and

size adjusting switch avoiding grooves disposed in the bottoms of the heel and the toe cap in a matched manner.

The beneficial effects of the present utility model are: by dividing the rollers into the front roller group and the rear roller group, and controlling the plurality of rear rollers to be arranged in a line or in a row through the reversing mechanism, independent selection of the arrangement direction of the rollers of the roller skate is realized, the scope of application of the roller skate is effectively extended, and the practicability is higher; by rotatably disposing the rotating bracket at the bottom of the skate body, and rotatably disposing the plurality of rear rollers on the rotating bracket, each rear roller and the rotating bracket can be controlled at the same time to rotate by using the reversing transmission mechanism, so the traveling direction of the rear rollers always faces the front and rear direction of the skate body after the rear roller group completes reversing; and the reversing mechanism is simple in structure, and a reversing method is convenient to operate.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a first schematic solid structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 2 is a second schematic solid structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 3 is a first schematic breakdown structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 4 is a second schematic breakdown structure diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 5 is a first partial sectional diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 6 is a second partial sectional diagram when a rear roller group of a roller skate of the present utility model is arranged in a line.

FIG. 7 is a first schematic solid structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a row.

FIG. 8 is a second schematic solid structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a row.

FIG. 9 is a schematic breakdown structural diagram when a rear roller group of a roller skate of the present utility model is arranged in a row.

FIG. 10 is a first partial sectional diagram when a rear roller group of a roller skate of the present utility model is arranged in a row.

FIG. 11 is a second partial sectional diagram when a rear roller group of a roller skate of the present utility model is arranged in a row.

DETAILED DESCRIPTION

Reference will be made in detail to the embodiment of the present utility model. Examples of embodiments are illustrated in drawings, in which same or similar reference numerals refer to same or similar elements or elements having the same or similar function throughout. The embodiment described below with reference to the drawings is exemplary and is intended to explain the present utility model and is not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that orientations or positional relationships indicated by terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “internal”, “external”, “clockwise”, “counterclockwise”, etc. are based on the orientations or positional relationships shown in the drawings, merely to facilitate the description of the present utility model and simplify the description, and do not indicate or imply that apparatuses or elements referred to must have a particular orientation and be constructed and operated in the particular orientation and therefore should not be construed as limiting the present utility model.

Furthermore, the terms “first” and “second” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the feature. In the description of the present utility model, the meaning of “a plurality” is two or more, unless specifically and specifically limited otherwise.

In the present utility model, unless explicitly stipulated and limited otherwise, the terms “mounted”, “connected”, “connecting”, “fixed” and so on are to be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or integrated connection; it may be a mechanical connection or an electrical connection; it may be direct connection or indirect connection through an intermediate medium, and it may be the internal communication between two elements. For those ordinary skilled in the art, the specific meaning of the above terms in the present utility model may be understood according to specific circumstances.

In the present utility model, unless explicitly stipulated and limited otherwise, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features do not make contact directly but through other features between them. Moreover, the first feature being “over”, “above”, and “on the top of” the second feature includes that the first feature is over and above the second feature, or only means that the level of the first feature is higher than that of the second feature. The first feature being “under”, “below” and “at the bottom of” the second feature includes that the first feature is under and below the second feature, or only means that the level of the first feature is lower than that of the second feature.

The present utility model will be described in further detail below with reference to specific implementations and the drawings.

Please refer to FIGS. 1-11, the present utility model provides a roller skate. The roller skate includes a skate body 10 and rollers disposed at the bottom of the skate body 10. The rollers may be divided into a front roller group 201 and a rear roller group 202. In order to facilitate distinction and understanding, we will name the rollers belonging to the front roller group 201 as front rollers 21, and the rollers belonging to the rear roller group 202 as rear rollers 22 in the following text.

The rear roller group 202 includes a plurality of rear rollers 22. The plurality of rear rollers 22 are disposed at the bottom of the skate body 10 through a reversing mechanism. The reversing mechanism may control the plurality of rear rollers 22 to be arranged in a line or in a row, and no matter whether the plurality of rear rollers 22 are arranged in the line or in the row, a traveling direction of the plurality of rear rollers 22 always faces the front and rear direction of the skate body. It is understandable that the traveling direction here refers to a running direction of the rollers in the skating process of the roller skate.

The reversing mechanism includes a reversing base 30, a reversing transmission mechanism 40, and a reversing adjustment switch 50.

The reversing base 30 is configured to rotatably dispose the rear roller group 202 at the bottom of the skate body 10. Specifically, the reversing base 30 includes a rotating bracket 31 and a rotating cover plate 32. The rotating bracket 31 is rotatably arranged at the bottom of the skate body 10 through the rotating cover plate 32. The plurality of rear rollers 22 are rotatably disposed on the rotating bracket 31.

In this embodiment, the bottom of the skate body 10 is provided with a circular rotating cavity 101, the rotating bracket 31 is accommodated in the rotating cavity 101, and the rotating cover plate 32 abuts against the outer side of the rotating bracket 31 and limits the rotating bracket 31 in the rotating cavity 101. The middle of the rotating cover plate 32 is provided with a rotating avoiding hole 321. A first rotating limiting boss 311 matched with the inner contour of the rotating avoiding hole 321 is disposed at a position, corresponding to the rotating avoiding hole 321, of a side, facing the rotating cover plate 32, of the rotating bracket 31. The rotating bracket 31 and the rotating cover plate 32 abut against each other through the first rotating limiting boss 311 and the rotating avoiding hole 321 to further limit the space of rotary motion of the rotating bracket 31. The outer side of the rotating cover plate 32 is provided with cover plate fixing holes 322, and the rotating cover plate 32 is fixedly installed at the bottom of the skate body 10 through screws matched with the cover plate fixing holes.

In this embodiment, the rear roller group 202 is preferably provided with two rear rollers 22. The rotating bracket 31 is provided with two transmission holes 312 correspondingly, and the two transmission holes 312 are located on the same diameter line of the rotating bracket 31 and are radially symmetrical. The two rear rollers 22 are respectively rotatably installed at the transmission hole 312 through corresponding rear roller brackets 220. The two rear rollers 22 may be jointly rotated by plus or minus 90 degrees around an axis of the rotating bracket 31 under the driving of the rotating bracket 31 so that an arrangement manner of the two rear rollers 22 may be switched between the line and the row. The two rear rollers 22 may be rotated by plus or minus 180 degrees around axes of the transmission holes 312 in the transmission holes 312 respectively so that the traveling direction of the two rear rollers 22 after reversing always faces the front and rear direction of the skate body.

The reversing transmission mechanism 40 is in transmission connection with each rear roller 22 and the rotating bracket 31, and is configured to drive each rear roller 22 and the rotating bracket 31 to rotate so that the plurality of rear rollers 22 are arranged in the line or in the row. The reversing transmission mechanism 40 includes an inner tooth groove 41 and guide gears 42. The inner tooth groove 41 is disposed in the bottom of the skate body 10, the inner tooth groove 41 is set in a circular shape, and a side wall thereof is an inner tooth surface. The guide gears 42 are outer gears, and are inserted in the inner tooth groove 41. Outer tooth surfaces of the guide gears 42 mesh with the inner tooth surface of the inner tooth groove 41. In this embodiment, there are two guide gears 42, and the two guide gears 42 are fixedly connected with the two rear rollers 22 one by one.

Specifically, the bottom of the skate body 10 is provided with the concave inner tooth groove 41 inside the rotating cavity 101, and the inner tooth groove 41 is disposed coaxial with the rotating cavity 101. The rear roller brackets 220 abut against a first side of the rotating bracket 31, the guide gears 42 abut against a second side of the rotating bracket 31, and the guide gears 42 are fixedly installed on the rear roller brackets 220. The rear roller brackets 220 have installing protruding columns 221 matched with the transmission holes 312 in inner diameter and depth. Upper top surfaces of the installing protruding columns 221 extend upwards to form positioning lugs 222, positioning grooves 421 are disposed in positions, corresponding to the positioning lugs 222, of lower bottom surfaces of the guide gears 42, and the positioning lugs 222 are in matched butt joint with the positioning grooves 421. Installing holes are disposed in corresponding positions of middles of the guide gears 42 and middles of the rear roller brackets 220, and the guide gears 42 and the rear roller brackets 220 are fixedly connected through male and female screws. The positioning lugs 222 are embedded in the positioning grooves 421 to form a connection manner similar to a tenon-and-mortise structure so that the guide gears 42 and the rear roller brackets 220 cannot move or rotate relative to each other after being fixedly connected.

Since the two rollers of the rear roller group 202 may be switched between line arrangement and row arrangement only by integrally rotating the rear roller group 202 by plus or minus 90 degrees, the inner tooth groove 41 and the guide gears 42 are provided with a rotating limiting structure in a matched mode, and the rotating limiting structure is configured to limit a rotatable angle of the rotating bracket 31 to be plus or minus 90 degrees. In this embodiment, the rotating limiting structure includes second rotating limiting bosses 61 disposed on the guide gears 42, and rotating limiting grooves 62 disposed in the inner tooth groove 41.

Please refer to FIG. 4, as a preferable embodiment, for ease of processing, the entire circular inner wall of the inner tooth groove 41 is covered with inner teeth. Since switching of the two rear rollers 22 of the rear roller group 202 between line arrangement and row arrangement only needs rotating by plus or minus 90 degrees, in other embodiments, the inner tooth groove 41 may only be provided with an inner tooth side wall with inner teeth at positions corresponding to the rotating limiting grooves 62.

The reversing adjustment switch 50 detachably abuts against the rotating bracket 31, and cooperates with the rotating bracket 31 to define a relative locking position and an unlocking position, so as to release locking of the rotating bracket 31 when reversing is needed, and lock the rotating bracket 31 when the plurality of rear rollers 22 are arranged in the line or in the row.

A concave locking notch 315 is disposed in the outer circumference of the rotating bracket 31. The reversing adjustment switch 50 includes a reversing switch main body 51 and a reversing elastic member 52. The reversing elastic member 52 is configured to elastically dispose the reversing switch main body 51 on a corresponding side of the rotating bracket 31. The reversing switch main body 51 includes a locking part 511 matched with the locking notch 315 to lock the rotating bracket 31 in cooperation with the locking notches 315, and a control part 512 configured to control the locking part 511 to be inserted into or removed from the locking notch 315. A reset direction of the reversing elastic member 52 faces the locking notch 315. The bottom of the skate body 10 is provided with a reversing switch installing groove configured to accommodate the reversing switch main body 51 and the reversing elastic member 52 and allow the reversing switch main body 51 and the reversing elastic member 52 to move.

The setting position and quantity of the locking notch 315 satisfy that the rotating bracket 31 may be locked by the locking part 511 when the plurality of rear rollers 22 on the rear roller group 202 are arranged in the line or in the row. In this embodiment, the locking notch 315 is formed in the outer side wall of the rotating bracket 31. Since the two rear rollers 22 on the rear roller group 202 may be driven to be switched between the line arrangement and the row arrangement every time the rotating bracket 31 rotates by plus or minus 90 degrees, the rotating bracket 31 is provided with four locking notches 315 corresponding to start ends of the two rotating limiting grooves 62 one by one. The included angle between the four locking notches 315 is 90 degrees.

In this embodiment, the reversing adjustment switch 50 is set as a toggle switch, and is installed at a heelpiece of the skate body 10. The control part 512 is a toggle block disposed at a first end of the reversing switch main body 51, and the locking part 511 is a locking block disposed at a second end of the reversing switch main body 51.

The reversing switch main body 51 further includes a fixing part 513, and the fixing part 513 is fixed to the skate body 10 through a fixing member 514. The skate body 10 is provided with a fixing member moving groove for the fixing member 514 to move accordingly when the locking part 511 is inserted into or removed from the locking notch 315. In this embodiment, the fixing part 513 is a cylindrical structure formed by downwards extending the reversing switch main body 51. The cylindrical structure is provided with a screw hole, and the fixing member 514 is a screw matched with the screw hole. The reversing elastic member 52 is a compression spring, and the fixing part 513 of the reversing switch main body 51 abuts against the compression spring. The fixing part 513 and the heelpiece of the skate body 10 are provided with a spring groove used for accommodating the compression spring and for the compression spring to extend and contract in a matched manner. The fixing member moving groove for the screw to move is disposed at a position, corresponding to the screw, of the skate body 10.

The skate body 10 includes a heel 11 and a toe cap 12. Both the front roller group 201 and the rear roller group 202 are disposed on the heel 11. In this embodiment, the front roller group 201 is provided with two front rollers 21, and the two front rollers 21 are fixedly disposed on the heel 11 through directional roller brackets 210 disposed at the bottom of the heel 11.

The toe cap 12 and the heel 11 are provided with a size adjusting mechanism in a matched manner. The size adjusting mechanism is configured to adjust the length of the roller skate in the front and rear direction so that the roller skate can be suitable for feet within a certain length range. The size adjusting mechanism includes a size adjusting switch 71 elastically disposed at the bottom of the heel 11, a plurality of size adjusting clamping openings 72 disposed in the toe cap 12 and arranged in the front and rear direction to define different shoe lengths, and size adjusting switch avoiding grooves 73 disposed in the bottom of the heel 11 and the bottom of the toe cap 12 in a matched manner.

The size adjusting switch 71 includes a size adjusting button and a size adjusting clamping block. The size adjusting clamping block may be in matched clamped connection with the size adjusting clamping openings 72. The size adjusting switch 71 is elastically disposed at the heel 11 through a size adjusting elastic member 74. A reset direction of the size adjusting elastic member 74 faces the size adjusting clamping openings 72 and is perpendicular to an arrangement direction of the size adjusting clamping openings 72. In this embodiment, the bottom of the heel 11 is provided with a size adjusting switch fixing hole 75, and the size adjusting switch 71 is elastically disposed at the bottom of the heel 11 through a size adjusting pin 76. The size adjusting elastic member 74 sleeves the size adjusting pin 76 and abuts the size adjusting switch 71 against the size adjusting switch fixing hole 75. The size adjusting button of the size adjusting switch 71 extends out of the size adjusting switch fixing hole 75. The plurality of size adjusting clamping openings 72 are arranged at regular intervals along the front and rear direction. The toe cap 12 is provided with a first size adjusting switch avoiding groove for the size adjusting switch 71 to move on one side of the size adjusting clamping openings 72. The heel 11 is provided with a second size adjusting switch avoiding groove 73 at a position corresponding to the size adjusting clamping openings 72 and the first size adjusting switch avoiding groove.

A brake block 13 is disposed behind the heel 11. A legging 14 is disposed above the heel 11. The toe cap 12 and the legging 14 are both provided with straps 15.

When the roller skate of the present application is in use, the arrangement manner of the rear rollers on the roller skate may be switched autonomously according to a user's wishes. When initially used, the rollers on the roller skate are all arranged in the line. When the user needs the roller skate to have better stability, the control part 512 is toggled, the control part 512 drives the locking part 511 to leave the locking notches 315, and then locking of the rotating bracket 31 is released; then, one of the rear roller brackets 220 is rotated, the rear roller bracket 220 drives the guide gears 42 to rotate, the guide gears 42 and the inner tooth groove 41 generate inner meshing transmission to drive the rotating bracket 31 to rotate, the rotating bracket 31 in turn drives the other rear roller bracket 220 to rotate, and finally, under the limit of the rotating limiting structure, the rear rollers 22 are arranged in the row; the control part 512 is released, the locking part 511 is inserted into the locking notches 315 under the resetting action of the reversing elastic member 52, and thus the rotating bracket 31 is locked; and at this moment, the rear roller group 202 is arranged in the row and is locked, so the roller skate is ready for use. When the user needs to set the rollers of the roller skate in the line, the control part 512 is toggled, the control part 512 drives the locking part 511 to leave the locking notches 315, and then locking of the rotating bracket 31 is released; then, one of the rear roller brackets 220 is rotated, the rear roller bracket 220 drives the guide gears 42 to rotate, the guide gears 42 and the inner tooth groove 41 generate inner meshing transmission to drive the rotating bracket 31 to rotate, the rotating bracket 31 in turn drives the other rear roller bracket 220 to rotate, and finally, under the limit of the rotating limiting structure, the rear rollers 22 are arranged in the line; the control part 512 is released, the locking part 511 is inserted into the locking notches 315 under the resetting action of the reversing elastic member 52, and thus the rotating bracket 31 is locked; and at this moment, the rear roller group 202 is arranged in the line and is locked, so the roller skate may be used as an inline roller skate. The roller skate of the present application has simple structure, diverse usage manners, simple usage methods, better usage experience, and higher practicability.

In the description of the specification, reference to a description of the terms “one implementation”, “some implementations”, “one embodiment”, “some embodiments”, “examples”, “specific examples”, or “some examples”, etc. means that specific features, structures, material or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present utility model. In the specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, material or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The above content is a further detailed description of the present utility model in conjunction with specific implementations, and it cannot be determined that the specific implementation of the present utility model is limited to these descriptions. For those ordinary skilled in the technical field to which the present utility model belongs, several simple deductions or substitutions can be made without departing from the concept of the present utility model. 

What is claimed is:
 1. A roller skate, comprising a skate body and rollers disposed below the skate body, and characterized in that the rollers are divided into a front roller group and a rear roller group, the rear roller group is disposed at a bottom of the skate body through a reversing mechanism, the rear roller group comprises a plurality of rear rollers, the reversing mechanism controls the plurality of rear rollers to be arranged in a line or in a row, and a traveling direction of the plurality of rear rollers always faces a front and rear direction of the skate body.
 2. The roller skate of claim 1, characterized in that the reversing mechanism comprises: a reversing base, comprising a rotating bracket, wherein the rotating bracket is rotatably disposed at the bottom of the skate body, and the plurality of rear rollers are rotatably disposed on the rotating bracket; a reversing transmission mechanism, in transmission connection with each rear roller and the rotating bracket, and configured to drive each rear roller and the rotating bracket to rotate so that the plurality of rear rollers can be arranged in a line or in a row; and a reversing adjustment switch, detachably abutting against the rotating bracket, wherein the reversing adjustment switch can release locking of the rotating bracket when reversing is needed, and lock the rotating bracket when the plurality of rear rollers are arranged in a line or in a row.
 3. The roller skate of claim 2, characterized in that the rear roller group is provided with two rear rollers, the rotating bracket is provided with two transmission holes located on the same diameter line and radially symmetrical, and the two rear rollers are respectively rotatably installed at the transmission holes through corresponding rear roller brackets; and the two rear rollers can be driven by the rotating bracket to rotate together around an axis of the rotating bracket, and the two rear rollers can respectively rotate around axes of the transmission holes in the transmission holes.
 4. The roller skate of claim 3, characterized in that the reversing transmission mechanism comprises: an inner tooth groove disposed in the bottom of the skate body; and guide gears meshing with the inner tooth groove, wherein there are two guide gears, and the two guide gears are fixedly connected with the two rear rollers one by one.
 5. The roller skate of claim 4, characterized in that the rear roller brackets abut against a first side of the rotating bracket, the guide gears abut against a second side of the rotating bracket, and the guide gears are fixedly installed on the rear roller brackets; and upper top surfaces of the rear roller brackets are provided with positioning lugs, positioning grooves are disposed in positions, corresponding to the positioning lugs, of lower bottom surfaces of the guide gears, and the positioning lugs are inserted in the positioning grooves.
 6. The roller skate of claim 4, characterized in that the inner tooth groove and the guide gears are provided with a rotating limiting structure in a matched mode, and the rotating limiting structure is configured to limit a rotatable angle of the rotating bracket to be plus or minus 90 degrees; and the rotating limiting structure comprises second rotating limiting bosses disposed on the guide gears, and rotating limiting grooves disposed in the inner tooth groove.
 7. The roller skate of claim 2, characterized in that the reversing base further comprises a rotating cover plate, and the rotating bracket is rotatably disposed at the bottom of the skate body through the rotating cover plate; and a middle of the rotating cover plate is provided with a rotating avoiding hole, and a first rotating limiting boss abutting against an inner side wall of the rotating avoiding hole is disposed at a position, corresponding to the rotating avoiding hole, of the rotating cover plate.
 8. The roller skate of claim 2, characterized in that the reversing adjustment switch comprises: a reversing switch main body; and a reversing elastic member configured to elastically dispose the reversing switch main body on one side of the rotating bracket; an outer side of the rotating bracket is provided with a concave locking notch; the reversing switch main body comprises a locking part matched with the locking notch to cooperatively lock the rotating bracket, and a control part configured to control the locking part to be inserted into or removed from the locking notch; and a reset direction of the reversing elastic member faces the locking notch.
 9. The roller skate of claim 8, characterized in that the reversing switch main body further comprises a fixing part, the fixing part is fixed to the skate body through a fixing member, and the skate body is provided with a fixing member moving groove for the fixing member to move accordingly when the locking part is inserted into or removed from the locking notch.
 10. The roller skate of claim 2, characterized in that the skate body comprises a heel and a toe cap, the heel and the toe cap are provided with a size adjusting mechanism in a matched manner, and the size adjusting mechanism comprises: a size adjusting switch elastically disposed at a bottom of the heel; a plurality of size adjusting clamping openings disposed in a bottom of the toe cap and arranged in a front and rear direction to limit different skate lengths, wherein the size adjusting switch can be inserted into or removed from the size adjusting clamping openings; and size adjusting switch avoiding grooves disposed in the bottoms of the heel and the toe cap in a matched manner. 